Millions under tsunami threat as fallout from monster 7.8 earthquake threatens U.S. | 18 Sept 2025 | A massive 7.8 magnitude earthquake has set off tsunami alerts in Alaska, Hawaii, and Russia. The quake struck near the Petropavlovsk-Kamchatsky region, off Russia’s east coast, on Thursday at 2:58pm ET. The National Oceanic and Atmospheric Administration’s (NOAA) tsunami warning system indicates that Hawaii faces a threat from dangerous waves caused by the earthquake. Two tsunami watches have been issued for Alaska’s Aleutian Islands, the closest US territories to the earthquake. This advisory in Alaska covered an area from Attu to the Amchitka Pass, which is 125 miles west of Adak, Alaska.